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BIG SIGNAL 4BS-15
4-Element Cubical Quad for High-Performance DX on 21 MHz / 15 Meters
The BIG SIGNAL 4BS-15 is a monoband directional Cubical Quad featuring 4 full-wave elements, developed for operators looking to take performance on 21 MHz / 15 meters to the next level.
With a configuration specifically focused on DX, contesting and weak-signal operation, it combines high gain, strong directivity and rugged construction for stations where every dB and every improvement in signal-to-interference ratio can make a difference.
Band: 21 MHz / 15 m
Type: monoband directional Cubical Quad
Elements: 4 full-wave elements
Gain: 10.37 dBi free space
F/B ratio: 25.47 dB
Polarization: horizontal
Recommended use: DX / contesting / weak signals / high-performance stations
Type: monoband directional Cubical Quad
Elements: 4 full-wave elements
Gain: 10.37 dBi free space
F/B ratio: 25.47 dB
Polarization: horizontal
Recommended use: DX / contesting / weak signals / high-performance stations
Why Choose the BIG SIGNAL 4BS-15?
• Four full-wave elements
The 4BS-15 uses four closed full-wave loops, specifically optimized for 21 MHz and designed to deliver high performance without relying on traps, loading coils or physically shortened elements.
The 4BS-15 uses four closed full-wave loops, specifically optimized for 21 MHz and designed to deliver high performance without relying on traps, loading coils or physically shortened elements.
• High gain for serious DX
Its configuration provides 10.37 dBi of free-space gain, concentrating energy toward the desired direction and improving the ability to work long-distance DX stations.
Its configuration provides 10.37 dBi of free-space gain, concentrating energy toward the desired direction and improving the ability to work long-distance DX stations.
• Excellent rear rejection
With a 25.47 dB front-to-back ratio, the antenna provides strong rejection of signals arriving from behind, helping reduce interference and improve selectivity during operation.
With a 25.47 dB front-to-back ratio, the antenna provides strong rejection of signals arriving from behind, helping reduce interference and improve selectivity during operation.
• Clean reception for weak signals
The closed-loop geometry, combined with its directivity and horizontal polarization, can provide a favorable signal-to-noise ratio against certain types of electrical noise, an important advantage when working signals close to the noise floor.
The closed-loop geometry, combined with its directivity and horizontal polarization, can provide a favorable signal-to-noise ratio against certain types of electrical noise, an important advantage when working signals close to the noise floor.
• Well-defined beam for DX and contesting
Its directional pattern concentrates transmitted and received energy toward the desired area while providing good rejection outside the main lobe, helping when working closely spaced signals or dealing with interference arriving from other directions.
Its directional pattern concentrates transmitted and received energy toward the desired area while providing good rejection outside the main lobe, helping when working closely spaced signals or dealing with interference arriving from other directions.
• Favorable performance with polarization variations
The characteristic geometry of a Cubical Quad can provide favorable behavior with certain variations in the polarization of received signals, helping maintain more stable reception under changing propagation conditions.
The characteristic geometry of a Cubical Quad can provide favorable behavior with certain variations in the polarization of received signals, helping maintain more stable reception under changing propagation conditions.
• Rugged construction for permanent installations
Its structure has been engineered to provide rigidity, mechanical stability and long-term durability for stations where the antenna will remain permanently installed outdoors.
Its structure has been engineered to provide rigidity, mechanical stability and long-term durability for stations where the antenna will remain permanently installed outdoors.
• Direct 50-ohm feed
The 4BS-15 uses a direct 50-ohm feed and is designed to handle up to 5,000 W PEP, making it easy to integrate into high-performance stations.
The 4BS-15 uses a direct 50-ohm feed and is designed to handle up to 5,000 W PEP, making it easy to integrate into high-performance stations.
For Operators Who Want More from 15 Meters
The BIG SIGNAL 4BS-15 is designed for stations looking for an antenna dedicated exclusively to 21 MHz, with a level of performance clearly focused on serious DX and contesting.
• 4 full-wave elements.
• 10.37 dBi free-space gain.
• 25.47 dB front-to-back ratio.
• High directivity and selectivity.
• Excellent performance for weak-signal operation.
• Up to 5,000 W PEP.
• Rugged construction for permanent outdoor installations.
• Specifically designed for DX and contesting on 15 meters.
• 10.37 dBi free-space gain.
• 25.47 dB front-to-back ratio.
• High directivity and selectivity.
• Excellent performance for weak-signal operation.
• Up to 5,000 W PEP.
• Rugged construction for permanent outdoor installations.
• Specifically designed for DX and contesting on 15 meters.
Four Elements to Take 15-Meter DX to the Next Level.
The BIG SIGNAL 4BS-15 combines four full-wave elements, 10.37 dBi of gain and high directivity in an antenna designed for stations looking to get the most out of the 21 MHz band.
Technical Specifications
Band: 21.0 - 21.450 MHz
Elements: 4
Gain: 10.37 dBi (free space)
F/B ratio: 25.47 dB
-3 dB beamwidth: 56°
Polarization: horizontal
SWR: 1.1:1 ~ 1.5:1
Impedance: 50 Ohms
Maximum power: 5,000 W PEP
Boom length: 23.95 ft (7.30 m)
Turning radius: 14.76 ft (4.50 m)
Overall height: 12.30 ft (3.75 m)
Weight: to be confirmed
Wind survival: > 99 mph (> 160 km/h)
Wind load: 17.05 ft² (1.584 m²) | 279.5 lbf (1,243.43 N) | @ 74.6 mph (120 km/h)
Elements: 4
Gain: 10.37 dBi (free space)
F/B ratio: 25.47 dB
-3 dB beamwidth: 56°
Polarization: horizontal
SWR: 1.1:1 ~ 1.5:1
Impedance: 50 Ohms
Maximum power: 5,000 W PEP
Boom length: 23.95 ft (7.30 m)
Turning radius: 14.76 ft (4.50 m)
Overall height: 12.30 ft (3.75 m)
Weight: to be confirmed
Wind survival: > 99 mph (> 160 km/h)
Wind load: 17.05 ft² (1.584 m²) | 279.5 lbf (1,243.43 N) | @ 74.6 mph (120 km/h)
4 elements and 10.37 dBi to take 15 meters to the next level
The BIG SIGNAL 4BS-15 combines 10.37 dBi of gain, a 25.47 dB front-to-back ratio and a 56° -3 dB beamwidth, providing a directional pattern especially well suited for DX, contesting and weak-signal work on 21 MHz.
Construction and Materials
• Boom-to-mast plate
Heavy-duty 9.84 x 5.91 x 0.31 in (250 x 150 x 8 mm) structural plate, sized to provide a strong and stable connection between the boom and mast.
Heavy-duty 9.84 x 5.91 x 0.31 in (250 x 150 x 8 mm) structural plate, sized to provide a strong and stable connection between the boom and mast.
• Heavy-duty boom
Square 3.15 in diameter x 0.079 in wall (70 x 2 mm) tubing, designed to provide the rigidity required for a four-element directional structure with an overall boom length of 23.95 ft (7.30 m).
Square 3.15 in diameter x 0.079 in wall (70 x 2 mm) tubing, designed to provide the rigidity required for a four-element directional structure with an overall boom length of 23.95 ft (7.30 m).
• Spreader support system
Constructed from 1.18 x 0.20 in (30 x 5 mm) angle profiles and incorporating a 0.16 in (4 mm) boom stabilizing element to increase overall rigidity and mechanical stability.
Constructed from 1.18 x 0.20 in (30 x 5 mm) angle profiles and incorporating a 0.16 in (4 mm) boom stabilizing element to increase overall rigidity and mechanical stability.
• Fasteners and hardware
Made from W4 stainless steel, selected to provide high mechanical strength, corrosion resistance and long-term durability in permanent outdoor installations.
Made from W4 stainless steel, selected to provide high mechanical strength, corrosion resistance and long-term durability in permanent outdoor installations.
• Fiberglass system
Custom-made fiberglass tubing with a half-round (semicircular) cross-section rather than conventional round tubing, specifically designed to fit the surface of the spreader supports. Reinforced with fiberglass fabric and UV protection for increased mechanical strength and long-term outdoor durability.
Custom-made fiberglass tubing with a half-round (semicircular) cross-section rather than conventional round tubing, specifically designed to fit the surface of the spreader supports. Reinforced with fiberglass fabric and UV protection for increased mechanical strength and long-term outdoor durability.
• BIG SIGNAL Wire by Messi & Paoloni
Special copper wire with a polyethylene (PE) jacket, selected to provide excellent weather protection and high mechanical strength.
Special copper wire with a polyethylene (PE) jacket, selected to provide excellent weather protection and high mechanical strength.
• Feed system
Direct 50-ohm feed, designed for a maximum power of 5,000 W PEP.
Direct 50-ohm feed, designed for a maximum power of 5,000 W PEP.
10.37 dBi and Four Elements for Serious DX on 15 Meters.
The BIG SIGNAL 4BS-15 combines four full-wave elements, 10.37 dBi of gain and a 25.47 dB F/B ratio in a structure developed for stations looking to take 21 MHz performance to a higher level.
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QSO with Álvaro EA2BY/QRP and PT9KK/QRP from Brazil
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